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Estimation of the content and parameters of a fluorescent fraction of dissolved organic matter
Author(s): A. D. Aponasenko
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Paper Abstract

Studying characteristics and properties of dissolved organic matter (DOM), its fluorescent fractions (FDOM) in waters of the Yenisei and Angara rivers has been carried out. Spectral light absorption coefficients (in spectral range 400-800 nm), as well as the intensity of DOM fluorescence in three wave lengths (505, 525 and 540 nm) at the wave length of exciting radiation 390 nm have been determined. Total DOM concentration was defined by the standard method of bichromatic oxidation. In the studied water objects the relation of average efficacy (r= 0.6) between fluorescence intensity and DOM concentration as well as absence of relation between light absorbing and DOM concentration are noted. To get a qualitative and quantitative assessment of FDOM parameters the calculation algorithm was suggested based on similarity of dependency course (variations) of FDOM characteristics and corresponding dependencies of total DOM characteristics. The following parameters were used: coefficients which characterize inclination of spectral distribution of light absorption and DOM fluorescence, also specific coefficients of absorbing DOM and FDOM radiation at the wave length of fluorescence excitation (κsp, κf sp), energy (and quantum) fluorescence efficiencies for DOM and its fluorescent fraction as well as specific fluorescence for DOM and FDOM, respectively. These calculations enabled to assess the most probable FDOM parameters. The FDOM share in the total DOM varies for studied waters from 8 to 40% at the average value 19%. The quantum efficiency varies from 0.18 to 0.40 (an average value is 0.28). Specific light absorption coefficients of DOM and FDOM are on average close between each other (κf sp / κsp makes 0.93). Some decrease of the share of fluorescent DOM fractions at the increase of both total DOM and FDOM was stated what says about different correlation of FDOM and non- fluorescent fractions in allochthonous OM due to which the main variations take place both in DOM and in indigenous OM which is formed in the water storage due to photosynthesis.

Paper Details

Date Published: 1 November 2006
PDF: 7 pages
Proc. SPIE 6522, Thirteenth Joint International Symposium on Atmospheric and Ocean Optics/ Atmospheric Physics, 65221W (1 November 2006); doi: 10.1117/12.723226
Show Author Affiliations
A. D. Aponasenko, Institute of Computational Modelling (Russia)

Published in SPIE Proceedings Vol. 6522:
Thirteenth Joint International Symposium on Atmospheric and Ocean Optics/ Atmospheric Physics
Gennadii G. Matvienko; Victor A. Banakh, Editor(s)

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